चित्र:US Patent 3118022 - Gerhard M. Sessler James E. West - Bell labs - electroacustic transducer - foil electret condenser microphone 1962 1964 - pages 1-3.png

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विवरण United States patent 3118022 of first foil electret microphone (electroacoustic transducer), invented by G. M. Sessler and J. E. West at Bell Laboratories in 1962.
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  • 2007-08-31 16:55 Nasoeng 3964×1958×1 (211793 bytes) United Staten patent of first electret microphone (electroacustic transducer), invented by G. M. Sessler and J. E. West at Bell Laboratories in 1962.

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